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HighVulnerabilityupdated 27 Oct 2026, 12:23 UTC

Apache HTTP Server: several flaws let attackers run code or crash the server

Several weaknesses in the Apache web server could let an outside attacker run their own commands on the server, crash it, get past security checks, or read private data. Attackers do not need a login to try.

Official source
SeverityHighVulnerability
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official sourceBacked by an official source

How the attack works simplified

  1. 1Remote attackerNo login or account needed
  2. 2Crafted requestSent to the public web server
  3. 3Apache flaw triggeredWeakness in request handling
  4. 4Code runs or crashDepends on the specific flaw
  5. ResultAttacker controls or disrupts the web server

What happened

Multiple vulnerabilities in Apache HTTP Server allow a remote, anonymous attacker to execute arbitrary code, cause denial of service, bypass security mechanisms, disclose confidential information, and perform cross-site scripting and data modification. Specific CVE details are not given in the material.

Why it is dangerous: A successful attack could give the attacker control of the web server or take it offline, exposing or altering the data and websites it hosts.

Are you affected?

You are affected if you run Apache HTTP Server on a system reachable from the internet or an untrusted network, as the material does not specify exact affected versions.

Apache HTTP Server (versions not specified in the material)

What to do

  1. Identify all Apache HTTP Server installations and their versions
  2. Check the official Apache security advisories and CERT-Bund for the fixed version
  3. Update Apache HTTP Server to the fixed version as soon as possible
  4. Review server logs for unusual requests while the update is pending

Timeline

  1. 27 Oct 2026, 12:16 UTC
    Publicly disclosed
  2. 27 Oct 2026, 12:16 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  3. 27 Oct 2026, 12:17 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  4. 27 Oct 2026, 12:18 UTC
    Picked up by Zero Radar

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
ZR-a400a956
Disclosed
27 Oct 2026, 12:16 UTC
On Zero Radar
27 Oct 2026, 12:18 UTC (2 min after disclosure)
Last change
27 Oct 2026, 12:23 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Apache HTTP Server: several flaws let attackers run code or crash the server · Zero Radar